On Mon, Jun 24, 2019 at 04:28:34PM +0200, Jakub Jelinek wrote: > On Sun, Jun 23, 2019 at 02:51:06PM +0100, Richard Sandiford wrote: > > What do you think? Is it worth pursuing this further? > > Wouldn't it be more useful to just force all automatic variables to be > used at the end of their corresponding scope? That is IMHO the main issue > with -Og debugging, VTA is a best effort, if we can express a variable with > some expression, nice, but if there is no expression nor memory nor register > that holds the value, we are out of luck. Could be some magic stmt like > gimple_clobber or ifn or something similar, which would make sure that at > least until expansion to RTL we force those vars to be live in either a > register or memory. > I'm afraid having different modes, one in which debug stmts can't and one > where they can affect code generation might be a maintainance nightmare.
This is pretty much exactly what USE in RTL is? Maybe use a similar name in Gimple? Segher
